Codeigniter 's Flexibility Part-1

I am looking to test Codeigniter 's Flexibility... actually there are few points that cause me to deep dive in codeigniter.

1. Can we keep associated views/controllers/models in the same folder ?
i.e.

/system/application/modules/MODULENAME/controllers/
/system/application/modules/MODULENAME/models/
/system/application/modules/MODULENAME/views/

2. Can we load and render one controller from within another controller ?

3. Can we call more than one controller per request in codeigniter project ?

I have looked on net ... did some googling ;) and working on it and got a very good response. Hope will get success very soon, till then happy coding and enjoy winter weather...